Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A chemical engineer is studying the two reactions shown in the table below.
In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant
temperature of 146.0 °C and constant total pressure. Then, he measures the reaction enthalpy AH and
reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the
second reaction. The results of his measurements are shown in the table.
Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to
zero decimal places.) Then, decide whether, under the conditions the engineer has set up, the reaction is
spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous
because the system is at equilibrium.
Transcribed Image Text:A chemical engineer is studying the two reactions shown in the table below.
In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant
temperature of 146.0 °C and constant total pressure. Then, he measures the reaction enthalpy AH and
reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the
second reaction. The results of his measurements are shown in the table.
Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to
zero decimal places.) Then, decide whether, under the conditions the engineer has set up, the reaction is
spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous
because the system is at equilibrium.
AH = 33. kJ
J
AS = 79.
K
2 Fe (s) + 3H,0 (1) - Fe,0,(s) + 3H, (g)
AG =
Which is spontaneous?
O this reaction
O the reverse reaction
O neither
AH = - 1237. kJ
AS =
6C (s) + 6H, (g) + 30,(g) – C,H1,0,6)
AG = - 42. kJ
Which is spor
aneous?
O this reaction
O the reverse reaction
O neither
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